Emulate 3 button mouse not working properly on linux mint 18.3
I use Mint 18.3, blender 2.79 and emulate 3 button mouse with no issues using a wacom tablet. Keep in mind that the shortcuts and gestures on the operating system take precedence over Blender. You might want to re-configure them so that they do not interfere. On the system preferences (for cinnamon) there are settings in the windows section and Windows tiling that need to be disabled. Also the keyboard shortcuts that use Alt, Ctrl and other keys work better if you disable them or map them to the super (windows) key.